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[Maciej Lopuszanski <mackos1@xxxxx>]

I found kind of a workaround for this problem.
1. gedit /etc/default/grub
2. change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"

3. sudo update-grub
4. reboot
5. now the brighness controls works but there is no indicator on the upper right corner (I can live with that)

I dont know what the option 'acpi=off' exaclty does....... so I dont know if it is a valid solution for the problem.
(maybe something else wont work correclty - time will tell.)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/880096

Title:
  cant change laptop brightness

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  can`t change laptop brightness, software controls in settings center doesnt have any effect. 
  while typeing on keyboard the status of the screen brightness changes [top right] but aktual brightness does not change.
  laptop dell vostro 3700. (yes, the one on the ubuntu homepage)

  using ubuntu 11.10 fresh install.

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